. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 702 Contribution from the Bureau of Chemistry CARL L. ALSBERG, Chief. S\J9-"^^L. Washington, D. C. V September 12, 1918 EFFICIENCY OF COMMERCIAL EGG CANDLING. By M. K. Jenkins, Assistant Bacteriologist, assisted by C. A. Bengtson, Investigator in Egg Handling. Prepared under the direction of M. E. Pennington, Chief, Food Research Laboratory. CONTENTS. Page. Purpose of investigation 1 Plan and scope of investigation'. 2 Relation of quality of eggs to accuracy in candling 3 Efficiency of candling bad eg
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN No. 702 Contribution from the Bureau of Chemistry CARL L. ALSBERG, Chief. S\J9-"^^L. Washington, D. C. V September 12, 1918 EFFICIENCY OF COMMERCIAL EGG CANDLING. By M. K. Jenkins, Assistant Bacteriologist, assisted by C. A. Bengtson, Investigator in Egg Handling. Prepared under the direction of M. E. Pennington, Chief, Food Research Laboratory. CONTENTS. Page. Purpose of investigation 1 Plan and scope of investigation'. 2 Relation of quality of eggs to accuracy in candling 3 Efficiency of candling bad eggs in 6 Bad eggs distinguishable by candling 6 Bad eggs not distinguishable by candling 10 Efficiency of candling rejects 11 Good eggs in rejects 11 Accuracy in recandling rej ects , 13 Accuracy of candling crews 14 Experienced candlers vs. inexperienced candlers under good management 14 Inexperienced crews under poor man- agement 17 Essentials of good management 18 Summary 18 PURPOSE OF INVESTIGATION. It is common knowledge among those buying and selling eggs that grading by the candle is not an absolutely dependable method for the separation of good and bad eggs. As it is the best method known for determining the quality of eggs in the shell, however, it is important to learn its degree of efficiency. This bulletin aims to show the effectiveness of commercial candling in detecting different dnds of good and bad eggs, as well as the variations in efficiency of different candling forces. In a previous publication,^ prepared as a guide to beginners wishing to learn how to candle eggs, detailed descriptions, accompanied in many instances by illustrations, are given of the different types of good and bad eggs of common occur- rence. The classifications and descriptive terms given there are used in this publication. The purpose of the investigation here reported, then, may be sum- marized as follows: To find (1) the relative error in the candling of different types of g
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